Sewer Medallions

OK, so I probably made up the term “sewer medallions,” but what else would you call those plates attached to storm drain covers? The ones that remind you to be responsible about what you pour into streets and driveways, or directly into sewers?

Here are two medallions that I see on local walks.

And here are two from Florida.

Yes, I take pictures of sewer medallions on vacation. Doesn’t everyone?